Make Ahead Mashed Potatoes

Bahan-bahan (12 porsi)

• 5 pounds Yukon Gold potatoes ((peeled, boiled & mashed))
• 6 ounces cream cheese
• 8 ounces sour cream
• 1/2 cup milk or half and half cream
• 2 teaspoons onion salt
• freshly ground black pepper, (to taste)